[Radiance-general] rsensor vs. rtrace

[John Mardaljevic]

Hi Bshara (& Rob),

> As far as the 30% difference, it's hard to say if that's good agreement or poor, without knowing more about the model, particularly how you re-created the sky conditions for the model.

For a real-world setting (with trees!), I'd say you were doing pretty good to get within 30%.  Is that repeatable for other times/days?  If not, it might be a 'lucky hit'.  Either way, comparison of simulation with measurements is a valuable exercise I'd recommend to anyone new to Radiance (or any lighting simulation program for that matter).

Cheers
John

John Mardaljevic PhD FSLL
Professor of Building Daylight Modelling
School of Civil & Building Engineering
Loughborough University
Loughborough
Leicestershire
LE11 3TU, UK

Tel: +44 1509 222630 (Direct)
Tel: +44 1509 228529 (Pam Allen, secretary)

j.mardaljevic at lboro.ac.uk

http://www.lboro.ac.uk/departments/civil-building/staff/mardaljevicjohn

Personal daylighting website:
http://climate-based-daylighting.com